67388561 has 8 divisors (see below), whose sum is σ = 72563040. Its totient is φ = 62348608.

The previous prime is 67388557. The next prime is 67388569. The reversal of 67388561 is 16588376.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67388561 - 2² = 67388557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67388569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32591 + ... + 34596.

It is an arithmetic number, because the mean of its divisors is an integer number (9070380).

Almost surely, 2^67388561 is an apocalyptic number.

It is an amenable number.

67388561 is a deficient number, since it is larger than the sum of its proper divisors (5174479).

67388561 is a wasteful number, since it uses less digits than its factorization.

67388561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67263.

The product of its digits is 241920, while the sum is 44.

The square root of 67388561 is about 8209.0535995327. The cubic root of 67388561 is about 406.9384509309.

The spelling of 67388561 in words is "sixty-seven million, three hundred eighty-eight thousand, five hundred sixty-one".